CN1325215C - Cyclic superimposed chopper energy-saving pulse power source for spark machining - Google Patents
Cyclic superimposed chopper energy-saving pulse power source for spark machining Download PDFInfo
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- CN1325215C CN1325215C CNB2004100438385A CN200410043838A CN1325215C CN 1325215 C CN1325215 C CN 1325215C CN B2004100438385 A CNB2004100438385 A CN B2004100438385A CN 200410043838 A CN200410043838 A CN 200410043838A CN 1325215 C CN1325215 C CN 1325215C
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- power switch
- switch pipe
- pulse
- power
- power supply
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Abstract
The present invention discloses a pulse power supply for electric spark machining in the field of mechanical machining, particularly a circular superposition chopping energy-saving pulse power supply for electric spark machining. The power supply comprises a DC power supply (2), a main vibration circuit (3), a driving circuit (1), a plurality of power switch tubes (T1 to Tn), a machining electrode (4-1) for electric spark machining and a work piece (4-2), wherein the anode of the DC power supply (2) is respectively connected to the collector of each power switch tube (T1 to Tn), the emitter of each power switch tube (T1 to Tn) is connected to the machining electrode(4-1) for electric spark machining, and the work piece (4-2) is connected to the cathode output end of the DC power supply (2), and the output end of the main vibration circuit (3) is connected to the input end of the driving circuit (1). Pulse signals (S1 to Sn) respectively outputted by a plurality of output ports of the driving circuit (1) are respectively applied to the base electrodes of the power switch tubes (T1 to Tn). The pulse width (h) of the pulse signals (S1 to Sn) is less than the width (h') of the ascending edge of current between emitters and collectors after the power switch tubes (T1 to Tn) are switched. Because a main machining loop of the power supply does not contain a current limiting resistor, a great amount of power loss is saved. The adoption of a structure limiting the conduction time of power tubes can effectively prevent the power tubes from being burnt.
Description
Technical field:
The present invention relates to the pulse power of spark machined in a kind of field of machining.
Background technology:
The employed pulse power of spark machined can be divided into the traditional pulse power that does not adopt power-saving technology and the energy-saving pulse power that adopts power-saving technology at present.The tradition pulse power adopts power switch pipe by turning on and off between the pulsewidth of setting, arteries and veins more, pulse voltage is added on the discharging gap between machined electrode 4-1 and the workpiece 4-2, as shown in Figure 8, for preventing power switch pipe T
1, T
2... T
nThe electric current that flows through after the complete conducting is crossed senior general, and it burns out, and adopts resistance R
1, R
2... R
nLimit the growth of electric current, the adjusting of processing electric current size realizes by different numbers in parallel " resistance-power " switching tube branch road in the loop.But under the floating voltage situation about 100V commonly used, the self-heating of current-limiting resistance and pressure cooling can consume the energy of system about 70%～80%, have only the energy about 20% to be used to process, the energy consumption problem of the visible this pulse power is very outstanding.Except the pulse power of above-mentioned band current-limiting resistance, many companies and research institution have developed the multiple energy-saving type pulse power, their major loop form and control strategy are varied, common ground all is to adopt the alternative current-limiting resistance of inductance in inductance element or the transformer coil to carry out current limliting and energy storage, thereby the utilization rate of electrical of the pulse power is increased substantially.But because the existence of inductance element makes the Pulse Electric parameter adjustable range of energy-saving pulse power supply of these forms be restricted.
Summary of the invention:
The purpose of this invention is to provide a kind of novel energy-conserving electric spark working pulse power source, reduce useless power attenuation to greatest extent, add the energy utilization rate in man-hour with raising, to guarantee simultaneously power parameter can be on a large scale, flexibly, the accurate adjusting.Technical scheme of the present invention is: a kind of circulation stack chopped mode energy saving spark machining pulse power supply, it comprises dc source 2, main vibration circuit 3, drive circuit 1, several power switch pipes (T
1～T
n) and the machined electrode 4-1 and the workpiece 4-2 of spark machined, the cathode output end of dc source 2 is connected power switch pipe (T
1～T
n) colelctor electrode on, power switch pipe (T
1～T
n) emitter stage connect machined electrode 4-1, workpiece 4-2 is connected on the cathode output end of dc source 2, the output that produces the main vibration circuit 3 of pulse signal connects the input of drive circuit 1, several output ports of drive circuit 1 are output pulse signal S respectively
1, S
2S
n, pulse signal S
1, S
2S
nBe applied to power switch pipe T respectively
1, T
2T
nBase stage on, pulse signal S
1, S
2S
nPulse width h less than power switch pipe T
1, T
2T
nElectric current rising edge width h ' between collection-emitter-base bandgap grading after the conducting.It also comprises current detection circuit 5, current detection circuit 5 is connected between workpiece 4-2 and the dc source 2 to extract current signal, main vibration circuit 3 is made up of single-chip microcomputer 3-1 and PLD 3-2, the output of current detection circuit 5 connects the input of the single-chip microcomputer 3-1 of main vibration circuit 3, the output of single-chip microcomputer 3-1 connects the input of PLD 3-2, and the output of PLD 3-2 connects the input of drive circuit 1.The corresponding circulation stack of main vibration circuit 3 outputs copped wave drives signal and goes the driving power switch transistor T for drive circuit 1
1, T
2... T
n, to the dc source 2 stack copped wave that circulates, the two ends that the machining voltage between default pulsewidth, arteries and veins and current impulse the are added to electro discharge machining gapping place processing of discharging.Do not contain current-limiting resistance in the processing major loop of the present invention, can save a large amount of power attenuations like this, and the energy loss of power switch pipe is very little comparatively speaking, therefore energy-saving effect of the present invention is clearly.Under the situation that does not contain current-limiting resistance, burn out for preventing power switch pipe overcurrent under the situation of processing short circuit, adopt turning on and off of following method driving power switching tube.The variation that turns on and off chopper current in the process of single power switch pipe as shown in phantom in Figure 2, do not having under the situation of current limiting measures, if load short circuits, whole loop middle impedance is very little during the complete conducting of power switch pipe, electric current will rise to very high value, thereby it is burnt out.For avoiding burning out power switch pipe, adopt the measure of restriction ON time to control the process of turning on and off, as Fig. 2, t1 in the electric current uphill process or t2 just turn-off power switch pipe constantly, make its electric current begin to descend, solid line part among current waveform such as Fig. 2 is by the size that can control current peak opportunity of control shutoff.Use and remove to drive n road power switch pipe, formed continuous current waveform just each road electric current is superimposed, as shown in Figure 4 as the drive waveforms of Fig. 3.Duration with each road power switch pipe circulation conducting is set at selected pwm value t again
On, see Fig. 3, the duration that each road power switch pipe is all turn-offed are set between selected arteries and veins and are worth t
Off, just can obtain having the current waveform between default pulsewidth, arteries and veins.That the present invention has is simple in structure, reliable operation and the advantage that is suitable for promoting.
Description of drawings:
Fig. 1 is an electrical block diagram of the present invention, and Fig. 2 is the opening process collection-emitter current i waveform schematic diagram of single power switch pipe, and Fig. 3 is pulse signal S in the embodiment of the present invention one
1, S
2S
8Sequential chart, Fig. 4 to Fig. 6 is respectively the current waveform of three kinds of power switch pipe circulation break-makes and the schematic diagram of stack after-current waveform, Fig. 7 is the structural representation of main vibration circuit 3 in the embodiment of the present invention two, and Fig. 8 is the electrical block diagram of existing electric spark working pulse power source.
The specific embodiment:
The specific embodiment one: specify present embodiment below in conjunction with Fig. 1 to Fig. 3.It is by dc source 2, main vibration circuit 3, drive circuit 1, several power switch pipes (T
1～T
n) and the machined electrode 4-1 of spark machined and workpiece 4-2 form, the cathode output end of dc source 2 is connected power switch pipe (T
1～T
n) colelctor electrode on, power switch pipe (T
1～T
n) emitter stage connect machined electrode 4-1, workpiece 4-2 is connected on the cathode output end of dc source 2, the output that produces the main vibration circuit 3 of pulse signal connects the input of drive circuit 1, several output ports of drive circuit 1 are output pulse signal S respectively
1, S
2S
n, pulse signal S
1, S
2S
nBe applied to power switch pipe T respectively
1, T
2T
nBase stage on, at every power switch pipe (T
1～T
n) with dc source 2 between the current-limiting resistance of connecting be removed pulse signal S
1, S
2S
nPulse width h less than power switch pipe T
1, T
2T
nElectric current rising edge width h ' between collection-emitter-base bandgap grading after the conducting.Pulse signal S
1, S
2S
nThere is t pulse delay time between two adjacent signals
d
The specific embodiment two: specify present embodiment below in conjunction with Fig. 2 to Fig. 7.Present embodiment also comprises current detection circuit 5, current detection circuit 5 is connected between workpiece 4-2 and the dc source 2 to extract current signal, main vibration circuit 3 is made up of single-chip microcomputer 3-1 and PLD 3-2, the output of current detection circuit 5 connects the input of the single-chip microcomputer 3-1 of main vibration circuit 3, the output of single-chip microcomputer 3-1 connects the input of PLD 3-2, and the output of PLD 3-2 connects the input of drive circuit 1.Adopt single-chip microcomputer 3-1 that parameter preset in the single-chip microcomputer 3-1 and current detection circuit 5 detected current signals are analyzed, control PLD 3-2 sends and drives signal to drive circuit 1.Current detection circuit 5 feeds back to the current signal between the electro discharge machining gapping place among the single-chip microcomputer 3-1 as degenerative backward channel, and the program among the single-chip microcomputer 3-1 is done negative-feedback process to the variation of current signal, regulating impulse signal S
1, S
2S
nBetween td or pulse signal S pulse delay time
1, S
2S
nPulse width, thereby make the electric current held stationary at electro discharge machining gapping place place, improve crudy.Fig. 3's driving signal S of eight power switch pipes has drawn
1, S
1... S
8Schematic diagram, t
gBe single power switch pipe service time, td is that the adjacent power switching tube drives the signal rise edge delay time.For making electric current continuous, be the driving signal S of td blanking time
1, S
1... S
8Arrive in succession, at S
8Driving signal rising edge arrive after through t
dTime, S
1The driving signal rising edge of next circulation must arrive.The driving power switching tube carries out copped wave circularly like this, and the chopper current waveform schematic diagram of every of obtaining power switch pipe is seen i among Fig. 4
1, i
2... i
8Shown in, each waveform overlaps and the schematic diagram of not addition is seen i
OlShown in, the waveform schematic diagram after the stack (overlapping and addition) is seen i
SumShown in.From i
SumWaveform as seen, above-mentioned driving method can obtain having the continuous current waveform of certain ripple.The present invention controls time delay between single power switch pipe service time and the adjacent switch pipe current amplitude and ripple by controlling.Single power switch pipe service time of Fig. 4 and Fig. 5 equates, is tg
1, and the pass of time delay is td
2＞td
1, contrasting under two kinds of situations current waveform after the stack increases as can be known then that current amplitude reduces time delay, and ripple cycle and amplitude all increase simultaneously.Equate, be td the time delay between the adjacent switch pipe of Fig. 5 and Fig. 6
2, and the pass of single switching tube service time of two figure is tg
2＞tg
1But the switching tube of the current waveform notice of invitation after contrast stack service time increases then that current amplitude increases, and the amplitude of ripple changes not quite simultaneously, and the cycle is constant.
The specific embodiment three: specify present embodiment below in conjunction with Fig. 3 to Fig. 6.The difference of present embodiment and embodiment one is, to power switch pipe (T
1～T
n) when driving copped wave, once drive last power switch pipe of circulation T
nThe driving signal arrive after t time delay through setting
dAfter, power switch pipe T
1The driving signal arrive, drive circulation thereby beginning is next.Other composition is identical with embodiment one with annexation.So be provided with, save the number of power switch pipe.
Claims (2)
1, a kind of circulation stack chopped mode energy saving spark machining pulse power supply, it comprises dc source (2), main vibration circuit (3), drive circuit (1), several power switch pipes (T
1～T
n) and the machined electrode (4-1) of spark machined and workpiece (4-2), the cathode output end of dc source 2 is connected power switch pipe (T
1～T
n) colelctor electrode on, power switch pipe (T
1～T
n) emitter stage connect machined electrode (4-1), workpiece (4-2) is connected on the cathode output end of dc source (2), the output that produces the main vibration circuit (3) of pulse signal connects the input of drive circuit (1), and several output ports of drive circuit (1) are output pulse signal (S respectively
1, S
2S
n), pulse signal (S
1, S
2S
n) be applied to power switch pipe (T respectively
1, T
2T
n) base stage on, it is characterized in that pulse signal (S
1, S
2S
n) pulse width (h) less than power switch pipe (T
1, T
2T
n) electric current rising edge width (h ') between collection-emitter-base bandgap grading after the conducting; It also comprises current detection circuit (5), current detection circuit (5) is connected between workpiece (4-2) and the dc source (2), main vibration circuit (3) is made up of single-chip microcomputer (3-1) and PLD (3-2), the output of current detection circuit (5) connects the input of the single-chip microcomputer (3-1) of main vibration circuit (3), the output of single-chip microcomputer (3-1) connects the input of PLD (3-2), and the output of PLD (3-2) connects the input of drive circuit (1).
2, circulation stack chopped mode energy saving spark machining pulse power supply according to claim 1 is characterized in that power switch pipe (T
1～T
n) when driving copped wave, once drive last power switch pipe of circulation (T
n) the driving signal arrive after (t time delay through setting
d) after, power switch pipe (T
1) the driving signal arrive, drive circulation thereby beginning is next.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100438385A CN1325215C (en) | 2004-08-27 | 2004-08-27 | Cyclic superimposed chopper energy-saving pulse power source for spark machining |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100438385A CN1325215C (en) | 2004-08-27 | 2004-08-27 | Cyclic superimposed chopper energy-saving pulse power source for spark machining |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1597214A CN1597214A (en) | 2005-03-23 |
| CN1325215C true CN1325215C (en) | 2007-07-11 |
Family
ID=34665481
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2004100438385A Expired - Fee Related CN1325215C (en) | 2004-08-27 | 2004-08-27 | Cyclic superimposed chopper energy-saving pulse power source for spark machining |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1325215C (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1749606B1 (en) * | 2005-08-01 | 2013-03-13 | Agie Charmilles SA | Method and generator for electrical discharge machining |
| CN102114559B (en) * | 2010-01-05 | 2012-06-06 | 北京安德建奇数字设备有限公司 | Alternating polarity pulsed power supply |
| CN102626810B (en) * | 2012-05-02 | 2013-12-04 | 宣浩 | Vibration discharge processing method |
| CN104475886B (en) * | 2014-12-25 | 2017-02-22 | 西安建筑科技大学 | Chopped-mode energy-saving electromachining pulse power supply |
| US11084112B2 (en) * | 2018-05-31 | 2021-08-10 | Johnson Technology, Inc. | Electrical discharge machine time slice power supply |
| US11794263B2 (en) * | 2018-10-31 | 2023-10-24 | Makino Milling Machine Co., Ltd. | Power source device for electric discharge machine |
| CN112388079B (en) * | 2020-11-19 | 2022-08-05 | 西安理工大学 | Composite pulse working method of wire cut electrical discharge machining pulse power supply |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4945199A (en) * | 1986-11-14 | 1990-07-31 | Mitsubishi Denki Kabushiki Kaisha | Electric discharge machining method and device |
| CN1010291B (en) * | 1985-06-19 | 1990-11-07 | 洛迦诺电子工业股份有限公司 | Circuit arrangement for producing eroding pulses on spark erosion installation |
| CN2353475Y (en) * | 1998-11-26 | 1999-12-15 | 山东工业大学 | Impulse power-supply for spark processing |
| CN1113722C (en) * | 1999-06-01 | 2003-07-09 | 沙迪克株式会社 | Discharge processing power source and discharge processing method |
-
2004
- 2004-08-27 CN CNB2004100438385A patent/CN1325215C/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1010291B (en) * | 1985-06-19 | 1990-11-07 | 洛迦诺电子工业股份有限公司 | Circuit arrangement for producing eroding pulses on spark erosion installation |
| US4945199A (en) * | 1986-11-14 | 1990-07-31 | Mitsubishi Denki Kabushiki Kaisha | Electric discharge machining method and device |
| CN2353475Y (en) * | 1998-11-26 | 1999-12-15 | 山东工业大学 | Impulse power-supply for spark processing |
| CN1113722C (en) * | 1999-06-01 | 2003-07-09 | 沙迪克株式会社 | Discharge processing power source and discharge processing method |
Non-Patent Citations (1)
| Title |
|---|
| 先进电火花加工技术 赵万生，36-37，国防工业出版社 2003 * |
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| Publication number | Publication date |
|---|---|
| CN1597214A (en) | 2005-03-23 |
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Granted publication date: 20070711 Termination date: 20090928 |